EP 0472764 B1 19960306 - Method for reducing colour noise of a television signal
Title (en)
Method for reducing colour noise of a television signal
Title (de)
Verfahren zur Reduktion des Farbrauschens eines Fernsehsignals
Title (fr)
Procédé de réduction du bruit d'un signal de télévision couleur
Publication
Application
Priority
EP 90116639 A 19900830
Abstract (en)
[origin: EP0472764A1] A method for reducing the colour noise in the chrominance signals of a television image by means of an HQ (= High-Quality) filter (1) is described, in which a difference signal (FD) is derived from the chrominance signal (FR) of each line, on the colour component (F) of which a noise component (R) with a stochastic spectral distribution is superimposed, and from a noise-reduced reference chrominance signal (FK1) obtained from the chrominance signals of the vertically preceding lines, and in which the reference chrominance signal (FK1), which is included in the calculation of the difference signal (FD) of the vertically following line, is produced by recursive signal processing operations of the digital filter (1), and in which the noise component (R) of the chrominance signal is reduced by transversal signal processing operations. It is provided that the difference signal (FD), before passing through the recursive and the transversal signal processing operations, is supplied to a limiter (10) of the digital filter (1) in which, by means of amplitude-dependent attenuation, a modified difference signal (FDM) is derived which is included instead of the original difference signal (FD) in the recursive and in the transversal signal processing operations. <IMAGE>
IPC 1-7
IPC 8 full level
H04N 9/64 (2006.01)
CPC (source: EP KR US)
H04N 9/646 (2013.01 - EP KR US); H04N 11/048 (2013.01 - KR); H04N 11/16 (2013.01 - KR)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0472764 A1 19920304; EP 0472764 B1 19960306; DE 59010181 D1 19960411; JP H04234297 A 19920821; KR 100204436 B1 19990615; KR 920005650 A 19920328; US 5241370 A 19930831
DOCDB simple family (application)
EP 90116639 A 19900830; DE 59010181 T 19900830; JP 21904491 A 19910829; KR 910015239 A 19910830; US 74974391 A 19910826